<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <script>
        const arr = [{
            name: "a",
            id: 1
        },
        {
            name: "b",
            id: 2
        },
        {
            name: "c",
            id: 3
        },
        {
            name: "d",
            id: 4
        },
        {
            name: "e",
            id: 5
        },
        {
            name: "f",
            id: 6
        },
        {
            name: "g",
            id: 7
        }
        ]

        //找到id为5的对象
        const result = arr.find(item => item.id === 5)
        //找到id为5的小标
        const resultIndex = arr.findIndex(item => item.id === 5)

        console.log(result, resultIndex);
    </script>
</body>

</html>